[9.1] (backport #10454) Support proxy_url on otel translation logic

[mergify]

What does this PR do?

This PR handles conversion logic for proxy_url

Why is it important?

Checklist

• I have read and understood the pull request guidelines of this project.
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

How to test this PR locally

Related issues

• Closes [beats receivers] beatsauth extension used in translation doesn't understand the proxy_url type of type *url.URL #10205

---

This is an automatic backport of pull request #10454 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 0e53334 has failed:

On branch mergify/bp/9.1/pr-10454
Your branch is up to date with 'origin/9.1'.

You are currently cherry-picking commit 0e533344c.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   internal/pkg/otel/translate/otelconfig.go
	modified:   internal/pkg/otel/translate/otelconfig_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   internal/pkg/otel/translate/output_elasticsearch.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: 707a957

Failed CI Steps

• Unit tests - Ubuntu 22.04
• Unit tests - Ubuntu 22.04
• Unit tests - Ubuntu 22.04 with requirefips build tag
• Unit tests - Ubuntu 22.04 with requirefips build tag
• Unit tests - fips140=only Ubuntu 22.04
• Unit tests - fips140=only Ubuntu 22.04
• Unit tests - Ubuntu 22.04 ARM64
• Unit tests - Ubuntu 22.04 ARM64
• Unit tests - Windows 2022
• Unit tests - Windows 2022
• Unit tests - Windows 2016
• Unit tests - Windows 2016
• Unit tests - macOS 15 ARM
• Unit tests - macOS 15 ARM
• Unit tests - Windows 10
• Unit tests - Windows 10
• Unit tests - Windows 11
• Unit tests - Windows 11

History

cc @khushijain21